More Images of the Brachioradialis Muscle

More Information about the Brachioradialis Muscle

The brachioradialis muscle is a
synergist of the biceps brachii. It is a stronger flexor of the elbow when
the forearm (radioulnar joint) is in mid position somewhere between supination &
pronation. When the forearm is pronated, the brachioradialis muscle is
more active during flexion of the elbow because the biceps brachii does not have
mechanical advantage.

When the forearm is completely pronated, the brachioradialis tends to supinate
as it flexes while the opposite action is true when the radioulnar joint is in a
supinated position where it tends to pronate as it flexes.